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CONTENTS OF VOLUME XLIII. 
NUMBER I. 
. Geological and Statistical Notice of the Coal Mines in 
the vicinity of Richmond, Va.; by A. S. Woorpriper, 
. Regarding Human Foot-Prints in Solid Limestone ; “ 
Davin Date Owen, M. D., with a plate, 
. On the Identity of Pyrochlore with the Microlite of Prof. 
Shepard; by J. E. Tescuemacuer, and A. A. Hayes, 
On the Wisconsin and Missouri Lead ot. it ; 
James T. HopeE, - 
Observations on Photographic Sites by Weasse 
F. CHannine, 
On the Principle of Virwal Velocities ; by Prof. — 
DORE STRONG, 
Vil. A dangerous Postiesty. of Wood See lb a aa some 
of their other eee examined ; by Dr. Joun ae 
PLUMMER, - - - - - 
VII. Caricography ; by Prof. aC Dewey, with a plate, - 
IX. On the Dip and Variation of the Magnetic Needle in the 
X. 
a 
XI. 
XII. 
United States; by Prof. Ex1as Loomis, - 
On the Want of Identity between Microlite and Pyro 
chlore; by Prof. Coartes UrHaM SHEPARD, = - 
. Additional Objections to Redfield’s Theory of a : 
by Prof. Rosert Hare, M. D., - . ‘ 
Notice of two New Fossil Mammals from Heseieniak 
Canal, Ga.; with observations on some of the fossil 
quadrupeds of the United States; by R. Hannan, M. Me 
with a plate, - 
erent of a New Spices of of Thracia ; oP Prof, c. 
B. ApaMs, 
14 
